To Prevent VVPAT Failures, A Different Paper Roll And Modified Sensor

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New Delhi: 

A small hood on top of the contrast sensor and paper roll that does not soak humidity are some of the ingenious measures adopted to prevent failure of paper trail machines in extreme conditions, Chief Election Commissioner OP Rawat said.

After a large-scale failure of the VVPAT machines in the recent bypolls to four Lok Sabha seats, including Kairana and Bhandara Gondiya, and 10 assembly seats, the Election Commission’s technical expert committee carried out ‘root cause analysis’.

The committee, Mr Rawat told PTI, found that direct light falling on the contrast sensor of the paper trail machine led to the malfunction.

He said the committee also found that a certain type of paper roll soaked humidity, resulting in the failure of the paper to move properly on the spool of the VVPAT machine while printing the results.

“We made simple changes … a small hood was installed on the contrast sensor so that even if it is placed under direct light, it would not malfunction … The…

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